Allow setting :ip and :port from gorilla-options.

[jvtrigueros]

As is, you must pass the :ip and :port keys when starting the gorilla server via lein. Why can't we just allow users to set their port and ip in their project.clj.

[JonyEpsilon]

Hi. Thanks for this, and sorry for the slow reply. It looks like a good idea, and I will merge this in once I have time to make the next release :-)